Camphor c10h16o melts at 1784 degrees c and has kf377 km a, Ask an Expert

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Camphor (C10H16O) melts at 178.4 degrees C and has Kf=37.7 K/m. A sample of unknown substance that weighs .840g lowers the freezing point of 25g of camphor to 170.8 degrees C. What is the molar mass of unknown substance? Assume unknown solute does not dissociate in solution.

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